获取UUID

if ([[NSUserDefaults standardUserDefaults]objectForKey:@"UUID"]==nil) {

CFUUIDRef uuid = CFUUIDCreate(NULL);

CFStringRef uuidstring = CFUUIDCreateString(NULL, uuid);

//
就下面这个玩意

NSString *identifierNumber = [NSString stringWithFormat:@"%@",uuidstring];

//
存起来以后用

[[NSUserDefaults standardUserDefaults] setObject:identifierNumber forKey:@"UUID"];

[[NSUserDefaults standardUserDefaults] synchronize];

CFRelease(uuidstring);

CFRelease(uuid);

}

NSLog(@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"UUID"]);